C2, 16¢ Green, Airpost, F-VF, postally Used, straight edge on right Cat($35)

$18

C3, 24¢ Carmine Rose and Blue, VF, with inverted "FEDERALSBURG/MARYLAND" pre-cancel. Beautiful stamp and the cheapest "invert" you can get of this stamp! Cat($35) (Image)

$50

C4-5, 8¢ and 16¢ 1923 Airmails, C4 VF-XF NH and C5 VF-XF LH Cat($95) (Image)

$110

C6, 24¢ Carmine, Top Margin Single, F-VF NH, with vibrant, bright color Cat($130) (Image)

$120

C13-15, 65¢-$2.60 Graf Zeppelin Issues, C13 VF LH, others F-VF LH, beautiful colors Cat($1,080) (Image)

$1,000